The next benchmark is the CrystalDiskMark. The software provides throughput data based on sequential reads and writes, and random (512K/4K/4KQD32) reads and writes of various sizes.

We start the tests with the randomly chooses data, mainly incompressible:

Below you see the same test with 0 fill (compressible) data:

It is obvious that the random read and write performance of the Vertex 4 128GB SSD is the same no matter if the data is compressible or incompressible. The drive is slower than the competition when reading reading compressible data sequentially. Again, the drive's high reading and writing performance with high queue depths was confirmed, even with small data (4K). The chart below illustrates the 0-fill results of various SSDs: